Purpose -The objective of this paper is to demonstrate how a critical perspective (i.e. critical social theory) can be applied to provide understanding and insights into mechanisms as to why interorganisational information communication technologies (ICT) in construction projects is not used in the intended way. Design/methodology/approach -Habermas' critical social theory, in particular his models of action, is used for the critical analysis. From this perspective, the intended and actual use of document management and workflow management systems are studied in two construction projects. Findings -In construction projects, interorganisational ICT is intended to support instrumental action, communicative action and sometimes also dramaturgical action. However, in practice, this ICT is not used in the intended way because actors adopt strategic action and normatively regulated action as well.Research limitations/implications -The paper confirms the importance of analysing the social system and the technical system, and how these interact, to understand how and why actors use interorganisational ICT. Originality/value -This paper demonstrates how a critical social theory provides insights into mechanisms as to why interorganisational ICT in construction projects is not used in the intended way.